Patent GB-190118258-A (GB)
Title: Combined Electric Logs and Speed Recorders.
Inventor: DENISON FRANCIS NAPIER
Filed: 1901-09-12
Granted: 1902-09-12
Abstract: 18,258. Denison, F. N., Graham, A., and Dearlove, A. L., [trading as Graham & Co., A.]. 8ept. 12. Counting - apparatus ; speed indicators.-Relates to ships' logs and engine revolution counters. As the log A passes through the water, the portion D having screw blades roo tates, and the crank G terminating the spindle D<l> drives the spindle I, which is connected with the cross-shaft j<8> through the worm i and a reducing-train of wheels. The hand L, secured upon the end of the cross-shaft j<8>, consequently has its platinum point alternately in contact with platinum contacts (not shown) upon a bar K<2> which is insulated from the frame plate h<5> by a mica plate K. These contacts are in a circuit which runs from the terminal 3<1> of the battery 3 by the wire 7, binding- post 4, wires 9<1>, 10', binding-post 4<1>, metal contact b<1> on the insulating-disc B', spring pin N, wire 0, conducting-bar K', the platinum contacts, hand L, spindle j<8>, train of wheels and casing of the log, wire 1, binding-post 5<1>, wire 6<1>, electromagnet W, wires 7<1>, 8<1>, binding-post 5, and wire 6 to the other terminal 3<2> of the battery 3. Consequently the bell crank w bearing the armature w<6> is oscillated on its pivot w<1>, and the pawl arm w<7> secured to the armature w<6> drives ratchet-wheels U<2>, u<3>, Fig. 7, having forty-nine and fifty teeth respectively, and bearing a hand U<4> and disc U<3> respectively. The horizontal arm of the bell crank (which is not shown) plays against a re-setting spring. As one-fiftieth of a revolution corresponds to a space on the scale u<ll> of the disc U' equal to half a knot, during the revolution of the ratchet-wheel u
 the ratchet-wheel U<I> and the pointer U' are turned one revolution and a space equal to the length of one tooth, thereby moving the pointer U' one-fiftieth of a revolution in a reverse direction, in relation to the disc U<3>, that is to say, one space on the scale U<II> equal to 25 knots, or the total number of knots recorded on the scale ull. At the same time that this operation is being performed, paper T passing over the roller Q takes a chronographic record from the pen W<12> upon the arm W<11>, which is jointed to the electromagnetic bell cr:mk 2v. One of the platinum contacts is longer than the other, and therefore, as the paper passes over the roller, a longer deviation is made to indicate a knot and a short one to indicate a half - knot. The chronographic paper is pricked twice every hour and once every half-hour by a point 46 at the end of an electromagnetic arm 44 as a clock B makes and breaks a circuit. The actuating-rod of a counter Z, which is mechanically operated by the engine, makes and breaks the circuit comprising the wire 7, binding-screw 4, wire 9<1>, wire 10<1>, wire 9<8>, binding-post 14, wire 13, contacts ;s', z<a>, wire 14<1>, binding-post 15. wire 15', an electromagnet (not shown), wire 15<2>, binding-post 5, wire 6, and battery 3. The lever armature 23 of the unsbown electromagnet operates a counter 16, which at every thousand revolutions completes the circuit of an electromagnet Y' that, like the log electromagnet W, works a pawl arm and pen arm. The pawl arm drives a counter Y like the log counter reading to 1,250,000 revolutions, and the pen arm makes a corresponding chronographic record.